Upgraded 15 Micron Multi-layered Filtration - Powerful Double-layered Filtration System; 99.99% of coffee ground can be effectively filtered. With filtration accuracy of 15 microns, even the tiniest coffee ground will be filtered, giving you an extra clean and smooth taste. The conventional and ineffective single-layer filter has large filter holes, coffee grounds will leak into your coffee, which tastes and feels bad. Actual 100% Airtight Structure - You can hold it upside down and the coffee won't drip. The Airtight structure will lock in the flavor for up to 2 weeks, and completely isolate your brew from the fridge odor. Standout Features - Double Mesh Food Grade 304 Stainless Steel Filter (No coffee grounds will flow into your coffee from the filter); 3mm Thick High Borosilicate Glass, Temperature Differential Range:>165C (You can take it out of the freezer and pour into 100C boiling water directly); Easy to Pour Spout; Strong handle design. Match into Fridge Side Door - Just match into the side door of the refrigerator, does not take up your valuable refrigerator space. Advanced Filtration for Cold-brew Coffee & Tea - Sambangan advanced 15-micron filtering cold brew brewer is designed to make clean, savory cold brew coffee. But it can be widely used also for brewing various teas, including herbal teas. Enjoy a variety of savory drinks with Sambangan advanced filtration brewer. Also for hot tea, hot coffee, juice filter, or just as a water carafe.